Mille Lacs County is a county in the East Central part of the U.S. state of Minnesota. As of the 2020 census, the population was 26,459. Its county seat is Milaca. The county was founded in 1857, and its boundary was expanded in 1860.

Mille Lacs Lake is a large but shallow lake in the U.S. state of Minnesota. It is located in the counties of Mille Lacs, Aitkin, and Crow Wing, roughly 75 miles north of the Minneapolis-St. Paul metropolitan area.